Bought 2 cardinals today from my LFS, they had a tank with about 6 or 7 in which I observed for quite a while before deciding on the two I wanted. I noticed at the time that one had a torn tail fin with a bit missing so obviously avoided that one. When I got home after id acclimatized the fish and put them in my aquarium to my annoyance I realised that in the confusion of the fish darting around when being caught id ended up with the one with the torn fin. After observing this fish I noticed that he also has some dorsal fin errosion and he has noticable increased gill movement compared to the other one. What can this be? I was thinking gill parasites but dont see how that fits with the fin errosion? or alternatly could it be bacterial? If so is there any chance I can trat topically with formalin bath etc?
Regards Fred
Regards Fred